Pump



Feb. 7, 1928. 1,658,204

c. B. KRAus;

PUMP Filed Jan. 1, 1926 3 Sheets-Shee 1 Q5110 eiafofi am/MA,

Feb. 7, 1928. 1,658,204

C. B. KRAUSE PUMP Filed Jan.1. 1926 3 Sheets-Sheet 3 Patented Feb. 7',1928 UNITED. STATES PATENT OFFICE.

CONRAD B. KRAUSE, OF CLEVELAND, OHIO.

PUMP.

This invention relates to pumps and more particularly to pumpsespeciallyadapted for use as compressors in connection withrefrigerating apparatus.

It is one of the objects of the invention to provide a pump, ofrelatively small ca-.

pacity, that will be efiicient in operation and so designed as to have aminimum of wearing surfaces and these points. of wear so arranged thatthe wear. will not materially affect the operation of the pump forrelatively long periods of time. The invention has particular referenceto domestic refrigeration apparatusand it, is a further object toprovide a construction that will be .practi-.

cally noiseless, in operation and avoid the pulsations in the compressedfluid, which is one of the objectionable features of present types ofpumps of small capacity.

A further object ofthe invention is to provide a double-acting pump thatwill require very little, if any, more space than a singleacting pump ofthe same capacity.

A further object of the invention is to provide a pump of such simpledesign and construction that it may be manufactured on a commercialscale at a comparatively low cost.

Other objects of the invention and the features of novelty will beapparent from the following description taken inconnection with theaccompanying drawings, of which:

Fig. 1 is a side elevation of a pump embodyingmy invention;

Fig. 2 is a horizontal section on the line Fig.- 3 is a section on theline 33 of.

one of. the housing sections having a sub stantially'fiat end againstwhich there is secured the hollow housing section 11,v these sectionshaving peripheral flanges 12 and 13, respectively, which are securedtogether by screws or bolts lt. The flanges 12 and" 13 are, accuratelymachined so as to fit together,

asshown. at 15. A cylinder 16 is arranged within the section 11, of thehousing, and has bearing surfaces 17 and 18, at its ends, to fit againstaccuratelymachined surfaces at the end of the housing section 10, whichare in the same plane as the surfaces 15, so that all of thesesurfaces,on the end of the section 10, may be machined off by a single operation.The cylinder 16 has oppositely projecting trunnions 19 an 20, thetrunnion. 19 being mounted in a bearing sleeve 21,, in the housingsection 10, and the trunnion 20 being mounted in a bearing sleeve 22, inthe housing section 11. The boss 23,. carrying the sleeve 22, has itsouter end closed by a plug 24-. The cylinder 16 hasa removable head25-that is secured thereto by thescrews 26, and, the surfaces 17 andv 18are equally spaced onopposite sides of the trunnion 19.. A crank shaft27, arranged: parallel with the trunnions 19 and 20, is mounted in a theshaft 27. An out-board bearing 3a is carried by the studs 31 and 32 andsecured thereon. by a pin 35, the arrangement permitting the bearing 34:to be readily removed, for the purpose of permittitng removal of theynut 30, and then replaced in accurate alignment with the bearing sleeve28.. The bearing 34 supports the shaft 27 and is provided with adepending oil well. 36 from which the bearing 34' is lubricated by meansof the wick 37' A. pulley 38 is secured on the outer end of the shaft27with its hub abutting the end of the bearing 34 and'coopcrates with thehead 27, at the oppositeend of the shaft to hold the shaft againstendwise movement. The bearing 34 has an oilcatching fiange' 39, and a.passage 40 for draining the intercepted oil back into the oil well 36..

A double-acting piston arranged in the cylinder 16 and comprises themiddle section 41 onto which the end sections 42 and 43 are threaded.The sections 42 and 453 are each provided. with a packing ring 44 andthe middle sect-ion. 41 carries a wrist pin '45 which. projects throughelongated slots 46', infthe walls of the cylinders 16', and is connectedwith. the opposite arms of'a'yoke- 4.7, the wrist pin 45constituting,'in effect, a pair of trunnions projecting from oppositesides of the piston. The yoke 47 isopera= ftively connected'with thecrank pin 48,, on p operates closed by the plug 67.

the shaft 27, a screw 19 being carried by the crank for the purpose ofholding the yoke against displacement.

The trunnion 19 has an extension 50 which carries a thrust bearing 51'between'which and the bearing sleeve 21 there is a spring 52 for thepurpose of firmly and uniformly holding the surfaces 17 and 18 of thecylinder in sealing engagement with the abutting surfaces on the end ofthe section 10. The outer end of-the cavity containing the thrustbearing 51 and spring is closed by the plug 53 so as to prevent leakage.

The cylinder 16 has ports 54L and 55 adjacent its ends so that thepiston may travel practically to the ends of the cylinder with outcovering the ports, thereby permitting a practically complete dischargeof the contents upon each stroke. The port 5 1 cowith-an intake port 56and with a the housing section 10 the port 55 cooperates discharge port57 in In a similar manner,

with an intake port 58 and with a discharge port 59. The discharge ports57 and 59 are preferably made larger than the other ports mentioned, soas of the cylinder contents, on each stroke. The intake port 56 is incommunication with a vertically extending port 60 which is drilled inthe housing section 10 and has its outer end closed by a plug 61. in asimilar manner, the intake port 58 communicates with a verticallyextending port 62, which is drilled in the housing section 10 and hasits outer end closed by a plug 63. The ports 60 and 62 communicate witha horizontally extending port 6a, which is drilled in the housingsection 10 from one end and has its outer end closed by the plug 65. Thedischarge port 57 communicates with a vertically extending port thehousing section 10 and has its outer end the discharge port 59communicates with a vertically extending port. 68 that is drilled in thehousing section 10 and has its outer end closed by the plug 69. Theports'66 and 68 communicate with the horizontally extending port 70 thatis drilled in the housing section 10 and has a. threaded recess 71, atits outer end, to receive a pipe connection for conducting thecompressed fluid to the point of use. The housing section 11 has a boss72 that is provided with a threaded recess 73 to receive a connectionfor the intake pipe of the pump. A. port 74 communicates with the recess7 3 and registers with a port 7 5 in the housing section 10, whichcommunicates with the horizontal port 64. The port 75 has arranged in ita bushing 7 6 which has a seat 77 for one side.

of the valve 78, the opposite side of this valve being adapted tocooperate with a seat 79 in, the bushing 80. The valve 78 is mounted ona stem 81 which projects ,wrench.

ciated.

to allow a. full discharge the seat 77, the pump will draw in a supply66 that is drilled in In a similar manner,

Having thus nesaaoa through a stuffing-box 82 and has its outer endsquared, as shown at .83, to receive a The stem 81 is threaded in thehousing, as indicated at ea, so as to be moved endwise when it isturned.

The bushing has an interior bore that is slightly larger than the valvestem 81 to permit fluid to flow from a charging port 85 to the inletport ea. The charging port 85 is normally closed by the plug .86. Thehousingv section 10 has abase 87 adapted to be secured to a suitablesupport.

The symmetrical arrangement'of the surfaces 17 and 18, at equaldistances on opposite sides of the trunnion 19, insures against anyunbalanced forces tending to tilt the as to permit leakage at either.

cylinder so of these surfaces. The arrangement of the trunnions 19 and20, on opposite sides of the cylinder, also tends to hold the cylinder-in proper alignment.

r The provision of the double-acting valve 7 8 affords a convenientmeans for charging the system, with which the pump is assoll hen thevalve is closed against (in account'of using a double-acting cylinderand piston and the symmetrical arrangement of the surfaces 17 and l8,about the cylinder trunnions, it has been possible to provide a pumphaving practically double loo the capaclty' of the ordinarysingle-acting pump, but requiring little, if any, more space than wouldbe required for a singleacting pump. In addition to this, my improvedpump has the advantage, overj'a single-act ng pump,

of lessening the -'variations of pressure in the system by doubling thenumber of suction and discharge strokes in a given time.

described my invent-ion, I claim: 7

1. In pumps, the combination of a housing, acylinder osclllatablymounted in said housing, a doube-acting piston in said cylin ,7 derhaving a wrist pin projecting through the side Walls of the cylinder, acrank shaft,

and a yoke operatively' connected with-said wrist pin and'with saidcrank shaftfor reciprocating the piston.

2. In pumps, the combination of a' hous ing, a cylinder oscillatablymounted; in'said der having a wrist pin projecting through housing,adouble-acting piston in said cylin- V the side walls of the] cylinder,a crankshaft, said cylinder and said housing havingco operating bearingsurfaces and inlet and cischarge ports therein, spring means for.holding said surfaces in contact, and a-yoke operatively connected withsaid wrist pin and said crank shaft for reciprocating the piston.

3. In pumps, the combination of a housing, a cylinder having a trunnionmounting in said housing on which it oscillates, a double-acting pistonin said cylinder having a wrist pin projecting through the side walls ofthe cylinder, a crank shaft, said cylinder and said housing havingcooperating bearing surfaces on opposite sides of said trunnion mountingand inlet and discharge ports therein, spring means for holding saidsurfaces in contact, and a yoke operatively connected with said wristpin and said crank shaft for reciprocating saidpiston.

4. In pumps, the combination of a housing, an oscillating cylinder insaid housing, a piston in said cylinder, a crank shaft operativelyconnected with said piston, a hearing in said housing for said shaft, astuffing-box surrounding said shaft exteriorly of said bearing, asupporting stud in said housing arranged parallel with said shaft, and abearing for said shaft carried by said stud.

5. In pumps, the combination of a housing, an oscillating cylinder insaid housing, a piston in said cylinder, a crank shaft operativelyconnected with said piston, a bearing in saidhousing for said shaft, astuffingboX surrounding said shaft eXteriorly of said bearing, aplurality of supporting studs projecting from said housing parallel withsaid shaft, and a bearing for said shaft carried by said studs.

6. In pumps, the combination of a housing comprising two sections one ofwhich has a substantially flat end with a plurality of finished surfacesthereon all in the same plane and the other of which is hollow andprovided with marginal surfaces fitting against surfaces on said end,means for securing said sections together, an oscillating cylinderarranged within the second-mentioned section and having trunnionspositioned in aligned bearings in said sections, said cylinder and saidend having cooperating bearing surfaces arranged oil-opposite sides ofsaid trunnions and provided with ports for controlling the flow of fluidto and from the opposite ends of said cylinder, a spring cooperatingwith one of said trunnions for holding the last-mentioned surfaces insealing engagement, a double-acting piston in said cylinder, a crankshaft carried by said housing, a yoke operatively connected with saidcrank shaft, and a pin arranged at right angles to the axis of saidtrunnions and operatively connecting said yokewith said piston, saidcylinder having slots in its side walls in which said pin reciprocates.

7. In pumps, the combination of a h0using, an'oscillating cylinderhaving a trunnion mounting in said housing, said cylinder and housinghaving cooperating bearing surfaces equally spaced and symmetrically p0-sit-Zoned on opposite sides of the axis of said trunnion mounting withcooperating inlet and discharge ports in said surfaces, and spring meansassociated with said trunnion mounting for pressing said surfaces intosealing engagement.

In testimony whereof, I hereunto aflix my signature.

CONRAD B. KRAUSE.

